<bugfix>Fixed QPixmap scaled issue</bugfix> <ticket>#566</ticket>
<bugfix>Fixed QPixmap scaled issue</bugfix>
<ticket>#566</ticket>

gui/collection/workspace.py:
  - QBrowserWidgetItem.__init__: set icon only if the pixmap is not null

VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,minesense/VisTrails,minesense/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,Nikea/VisTrails,celiafish/VisTrails,hjanime/VisTrails,minesense/VisTrails,minesense/VisTrails,hjanime/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,Nikea/VisTrails,hjanime/VisTrails,hjanime/VisTrails,minesense/VisTrails,celiafish/VisTrails,VisTrails/VisTrails